The song of the male Dipper may be best described as a lively chatter, consisting of a variety of light tones uttered with different degrees of sound and expression, and is to be heard not only in the spring, but during the utmost severity of the winter. "Those," says Schinz, "who have listened to their cheerful voices on a bleak January morning, when every object in the landscape seemed frozen or dead, or watched the gay little singers as, in the very joyousness of their heart, they sprung through a hole into the ice-bound stream, to take their usual copious bath, would be inclined to believe that they are actually insensible to the chilling breath of the frost and the icy nature of the scene around them." Insects of all kinds constitute their principal means of existence. Gloger tells us that during the winter they also frequently eat mussels and small fish, and that this diet imparts a fishy flavour to their flesh. Should the season be unusually severe, they are sometimes compelled to venture forth and snatch a meal from the most unlikely places; thus we were informed by a miller in our neighbourhood that his mill was repeatedly visited during a heavy frost by a pair of these birds, they being attracted by the hope of obtaining a portion of the oil with which the mill-wheels were greased, and so overcome with hunger were the poor creatures that they swallowed the grease boldly, even when one of the men stood close to the spot. The period of incubation commences in April, one brood and occasionally two being produced within the year. The nest is constructed close to the surface of the water, and, if possible, in such a situation as to permit the stream to flow past it, and thus afford protection against the attacks of martens, weasels, cats, and such-like enemies; it is usually placed upon projecting stones or rocks, or in holes in bridges or mill-dams, and similar situations. In an instance that came under our own notice, it was built in the wheel of a mill that had for a time stopped work. All our endeavours to obtain a sight of the nest last mentioned would have been useless, had not the friendly miller drawn off the water, and thus permitted us to satisfy our curiosity. The cavity, or nook selected for the reception of the brood is lined with a thick bed of twigs, grass, straw, and moss, these materials being overspread with a layer of leaves. If the mouth of the hole be large it is covered with a kind of mossy lid, resembling that made by the Wren for her little abode, leaving only an entrance passage of very moderate dimensions. When placed among the machinery of a mill, the nest has sometimes required to be two feet long, in order to keep it firmly fixed on its precarious foundation. The eggs, from four to six in number, are of a glossy white, variously shaped, but generally from eight to ten lines long, and eight to eight and a half lines broad. Though the female broods with such diligence and